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The diagram shows an ordinary die in which the scores on opposite faces always total 7.
It is placed on a horizontal table with the '1' face facing East.
The die is moved four times, rotating it each time through 90 ° about an edge.
The faces in contact with the table are first 1, then 2, then 3, then 5.
In which direction is the 1 facing after this sequence of moves?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Given the nets of 4 cubes with the faces coloured in 4 colours, build a tower so that on each vertical wall no colour is repeated, that is all 4 colours appear.
Label the joints and legs of these graph theory caterpillars so that the vertex sums are all equal.